1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
|
/*------------------------------------------------------------------------*
* Originally implemented by Scott Flinn, in association with the
* Imager Graphics Laboratory at the University of British Columbia
* (scottflinn@alumni.uwaterloo.ca).
*
* This source code may be freely distributed and modified for any purpose
* as long as these introductory comments are not removed. Please be
* aware that this represents the author's initial experiments with the
* Java platform and should not necessarily be considered good examples
* of Java programming.
*------------------------------------------------------------------------*/
/*------------------------------------------------------------------------*
* The BW class implements the black-white contrast illusion. It is
* meant to be run in a separate window using AppletStarter.
*------------------------------------------------------------------------*/
import java.awt.*;
/*------------------------------ Class BW ------------------------------*/
public class BWApplication extends Panel
{
static BWPanel canvas;
static BWControls controls;
static Button dismiss;
public static void main(String[] args){
Frame f = new Frame();
f.addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent e) {
System.exit(0);
};
});
/*----------------------- constructor ------------------------*/
GridBagLayout gridbag;
GridBagConstraints c;
// Create the layout manager and a constraint object
gridbag = new GridBagLayout();
c = new GridBagConstraints();
f.setLayout( gridbag );
// Create the canvas panel and put it on top
canvas = new BWPanel();
c.gridwidth = GridBagConstraints.REMAINDER;
c.fill = GridBagConstraints.BOTH;
c.weightx = 1.0;
c.weighty = 1.0;
gridbag.setConstraints( canvas, c );
f.add( canvas );
// Create the control panel and put it second from the bottom
controls = new BWControls( canvas );
c.fill = GridBagConstraints.HORIZONTAL;
c.weighty = 0.0;
gridbag.setConstraints( controls, c );
f.add( controls );
// Create the dismiss button and put it at the bottom
dismiss = new Button( "Dismiss" );
gridbag.setConstraints( dismiss, c );
f.add( dismiss );
f.validate();
f.setVisible(true);
f.setSize(800,800);
f.setTitle("BWApplication");
f.validate();
}
/*-------------------------- action --------------------------*/
public boolean action( Event event, Object obj )
{
if ( event.target == dismiss )
{
hide();
System.exit(0);
return true;
}
return false;
}
}
/*--------------------------- Class BWPanel ----------------------------*/
class BWPanel extends Panel
{
// Gray range and initial values
public final int minColour = 0;
public final int maxColour = 255;
public final int startLeftColour = 128; // 50%
public final int startRightColour = 128; // 50%
// Drawing colours -- modified through setLeftGray and setRightGray methods
private Color leftColour;
private Color rightColour;
// Other drawing parameters -- can be modified directly
public final int minCenterSize = 5; // percent
public final int maxCenterSize = 100; // percent
public int centerSize = 40; // percent
public boolean showCenter = true;
public boolean inColour = false;
// Off-screen drawing buffer
private Dimension offDimension;
private Image offImage;
private Graphics offGraphics = null;
/*----------------------- constructor ------------------------*/
BWPanel()
{
int c;
// Create colour objects
c = startLeftColour;
leftColour = new Color( c, c, c );
c = startRightColour;
rightColour = new Color( c, c, c );
}
/*-------------------------- paint ---------------------------*/
public void paint( Graphics g )
{
update( g );
}
/*-------------------------- update --------------------------*/
public void update( Graphics g )
{
// Dimension d = size();
Dimension d = getSize();
int halfWidth = d.width / 2;
int squareSize;
int dx, dy;
// Create off-screen image for double buffering
if ( ( offGraphics == null ) ||
( d.width != offDimension.width ) ||
( d.height != offDimension.height ) )
{
offDimension = d;
offImage = createImage( d.width, d.height );
offGraphics = offImage.getGraphics();
}
// Draw left half background
if ( inColour )
offGraphics.setColor( showCenter ? Color.green : leftColour );
else
offGraphics.setColor( showCenter ? Color.white : leftColour );
offGraphics.fillRect( 0, 0, halfWidth, d.height );
// Draw right half background
offGraphics.setColor( showCenter ? Color.black : rightColour );
offGraphics.fillRect( halfWidth, 0, halfWidth, d.height );
// Draw centers if requested
if ( d.height < halfWidth )
squareSize = ( d.height * centerSize ) / 100;
else
squareSize = ( halfWidth * centerSize ) / 100;
if ( showCenter )
{
// Get horizontal and vertical border sizes
dx = ( halfWidth - squareSize ) / 2;
dy = ( d.height - squareSize ) / 2;
// Draw blocks in selected colour
offGraphics.setColor( leftColour );
offGraphics.fillRect( dx, dy, squareSize, squareSize );
offGraphics.setColor( rightColour );
offGraphics.fillRect(
dx + halfWidth, dy, squareSize, squareSize );
}
// Draw a black border
offGraphics.setColor( Color.black );
offGraphics.drawRect( 0, 0, d.width - 1, d.height - 1 );
// Finally, copy the off-screen image to the screen
g.drawImage( offImage, 0, 0, this );
}
/*---------------------- setLeftColour -----------------------*/
public void setLeftColour( int c )
{
if ( inColour )
leftColour = new Color( 0, c, 0 );
else
leftColour = new Color( c, c, c );
update( getGraphics() );
}
/*---------------------- setRightColour ----------------------*/
public void setRightColour( int c )
{
if ( inColour )
rightColour = new Color( 0, c, 0 );
else
rightColour = new Color( c, c, c );
update( getGraphics() );
}
/*------------------------ setCenter -------------------------*/
public void setCenter( boolean showCenter )
{
this.showCenter = showCenter;
update( getGraphics() );
}
/*----------------------- setInColour -----------------------*/
public void setInColour( boolean inColour )
{
this.inColour = inColour;
setLeftColour( leftColour.getGreen() );
setRightColour( rightColour.getGreen() );
update( getGraphics() );
}
}
/*-------------------------- Class BWControls --------------------------*/
class BWControls extends Panel
{
Scrollbar leftSlider; // Controls gray intensity of left side
Scrollbar rightSlider; // Controls gray intensity of right side
Scrollbar sizeSlider; // Controls size of center block
Checkbox showCenter; // Toggles drawing of center blocks
Checkbox inColour; // Toggles drawing between gray and green
BWPanel canvas; // The main drawing canvas
/*----------------------- constructor ------------------------*/
BWControls( BWPanel canvas )
{
GridBagLayout gridbag;
GridBagConstraints c;
Panel boxPanel;
// Record id of drawing canvas
this.canvas = canvas;
// Use a GridBag to lay things out
gridbag = new GridBagLayout();
c = new GridBagConstraints();
setLayout( gridbag );
// Create sliders and check boxes
leftSlider =
new Scrollbar(
Scrollbar.HORIZONTAL, canvas.startLeftColour,
( canvas.maxColour - canvas.minColour ) / 10,
canvas.minColour, canvas.maxColour );
rightSlider =
new Scrollbar(
Scrollbar.HORIZONTAL, canvas.startRightColour,
( canvas.maxColour - canvas.minColour ) / 10,
canvas.minColour, canvas.maxColour );
sizeSlider =
new Scrollbar(
Scrollbar.HORIZONTAL, canvas.centerSize,
( canvas.maxCenterSize - canvas.minCenterSize ) / 10,
canvas.minCenterSize, canvas.maxCenterSize );
inColour = new Checkbox( "Colour" );
showCenter = new Checkbox( "Backgrounds only" );
showCenter.setState( ! canvas.showCenter );
// Add check boxes in double column using a panel container
boxPanel = new Panel();
boxPanel.add( inColour );
boxPanel.add( showCenter );
addControl( (Component)boxPanel, 1.0, GridBagConstraints.HORIZONTAL,
GridBagConstraints.REMAINDER, gridbag, c );
// Add labels and sliders
addControl( (Component)(new Label( "Left intensity", Label.RIGHT )),
0.0, GridBagConstraints.NONE, 1, gridbag, c );
addControl( (Component)leftSlider, 1.0, GridBagConstraints.HORIZONTAL,
GridBagConstraints.REMAINDER, gridbag, c );
addControl( (Component)(new Label( "Right intensity", Label.RIGHT )),
0.0, GridBagConstraints.NONE, 1, gridbag, c );
addControl( (Component)rightSlider, 1.0, GridBagConstraints.HORIZONTAL,
GridBagConstraints.REMAINDER, gridbag, c );
addControl( (Component)(new Label( "Center size", Label.RIGHT )),
0.0, GridBagConstraints.NONE, 1, gridbag, c );
addControl( (Component)sizeSlider, 1.0, GridBagConstraints.HORIZONTAL,
GridBagConstraints.REMAINDER, gridbag, c );
}
/*------------------------ addControl ------------------------*/
private void
addControl( Component component, double wx, int fill, int gw,
GridBagLayout gb, GridBagConstraints c )
{
c.weightx = (float)wx;
c.weighty = 1.0;
c.fill = fill;
c.gridwidth = gw;
gb.setConstraints( component, c );
add( component );
}
/*-------------------------- insets --------------------------*/
public Insets insets()
{
return( new Insets( 5, 5, 5, 5 ) );
}
/*-------------------------- action --------------------------*/
public boolean action( Event event, Object obj )
{
if ( event.target == showCenter )
{
// Toggle showCenter flag of canvas
canvas.setCenter( ! showCenter.getState() );
return true;
}
if ( event.target == inColour )
{
// Toggle inColour flag of canvas
canvas.setInColour( inColour.getState() );
return true;
}
return false;
}
/*----------------------- handleEvent ------------------------*/
public boolean handleEvent( Event event )
{
if ( event.target == leftSlider )
{
// adjust left colour and redraw
canvas.setLeftColour( leftSlider.getValue() );
return true;
}
else if ( event.target == rightSlider )
{
// adjust right colour and redraw
canvas.setRightColour( rightSlider.getValue() );
return true;
}
else if ( event.target == sizeSlider )
{
// adjust center block size and redraw
canvas.centerSize = sizeSlider.getValue();
canvas.update( canvas.getGraphics() );
return true;
}
else
return super.handleEvent( event );
}
}
/*------------------------------------------------------------------------*/ |
[Débutant]Application à modifier
Répondre avec citation
Partager